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Author
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Topic: WHAT WILL MY RPMs BE ?
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johnmustang
Gearhead Posts: 3244
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001
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posted 01-09-2003 04:29 PM
   
I finally found myself a set of 3.25:1, 8 inch, 3rd member posi unit. It is on its way to me now, but , what I would like to know is, what will my RPMs be with a C4, at the following speeds:40 MPH = RPMs 50 MPH = RPMs 60 MPH = RPMs 70 MPH = RPMs 80 MPH = RPMs 90 MPH = RPMs 100 MPH = RPMs 110 MPH = RPMs Thanks in advance for your help on this one.
JOHN 
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65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK
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SteveLaRiviere
Administrator Posts: 30525
From: Saco, Maine
Registered: May 99
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posted 01-09-2003 04:32 PM
What size tire?------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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johnmustang
Gearhead Posts: 3244
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001
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posted 01-09-2003 04:37 PM
quote:
Originally posted by SteveLaRiviere:
What size tire?
They are 205/75R/14 JOHN ------------------
65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK
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GT350Clone
Journeyman Posts: 42
From: Kansas
Registered: Nov 2002
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posted 01-09-2003 04:37 PM
Depends on your tire size to be exact, but with my 215/55-16's (25.3" tall), I get (approx):40 MPH 1750 RPM
50 MPH 2200 RPM
60 MPH 2650 RPM
70 MPH 3100 RPM
80 MPH 3550 RPM
90 MPH 4000 RPM
100 MPH 4450 RPM
110 MPH 4500 RPM *edit 4900 RPM*
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My webpage: www.gt350clone.com
[This message has been edited by GT350Clone (edited 01-09-2003).]
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SteveLaRiviere
Administrator Posts: 30525
From: Saco, Maine
Registered: May 99
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posted 01-09-2003 04:57 PM
quote:
Originally posted by johnmustang:
They are 205/75R/14
Those are 26.11" tall, so that gives you: 40 MPH = 1718 RPMs 50 MPH = 2148 RPMs 60 MPH = 2578 RPMs 70 MPH = 3007 RPMs 80 MPH = 3437 RPMs 90 MPH = 3866 RPMs 100 MPH = 4296 RPMs 110 MPH = 4726 RPMs ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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johnmustang
Gearhead Posts: 3244
From: Vancouver Island , British Columbia , Canada
Registered: Nov 2001
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posted 01-09-2003 05:00 PM
quote:
Originally posted by SteveLaRiviere:
Those are 26.11" tall, so that gives you:40 MPH = 1718 RPMs 50 MPH = 2148 RPMs 60 MPH = 2578 RPMs 70 MPH = 3007 RPMs 80 MPH = 3437 RPMs 90 MPH = 3866 RPMs 100 MPH = 4296 RPMs 110 MPH = 4726 RPMs
Thanks Steve and GT350Clone JOHN ------------------
65 2+2 FASTBACK
87 TAURUS WAGON
98 F150 XLT TRITON V8 4.6, 4 WHEEL DRIVE
Member:Vancouver Island Mustang Association
M&M #1710
MyPhotoPage
MY TRUCK
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Fastymz
Moderator Posts: 8808
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 01-09-2003 06:04 PM
John try this site,you can put in any speed tire size or gears.It's a lot of fun I spend many hours on it.  http://www.prestage.com/carmath/calc_Gears.asp Dont worry about the RPM's just floor,it's all about whaaaaaaa factor anyways.  ------------------
SCOOP
oddly obsessed with big scoops on little Mustangs 2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
[This message has been edited by Fastymz (edited 01-09-2003).]
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